During the medieval era, was copper, in general, more expensive than iron (Fe , not steel)? This relates to the Green Grace’s statements concerning Meereen’s mineral wealth. Was copper still in relatively high demand, despite the widespread use of iron and steel, even before the development of cast bronze cannons? TY- RSAFan

Not really. The glory days of copper were in the Bronze Age. Once you can work iron, copper loses a lot of its value. 

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